In fact, they do not have a choice, because they will never be able entirely to block the tide of technological advance.
实际上，他们对此毫无办法，因为他们无法完全阻止技术进步的潮流。
2
The best it seems realistic to hope for as a matter of choice are technological improvements that will slow pollution, the exhaustion of resources, and global weather changes.
作为一种选择而言，最现实的希望是那些能够减少环境污染、能源耗竭和全球气候变化的技术进步。
3
Furthermore, linking with practical experience, to explore the common process of ultrasonic cleaning and the rational choice to the technological parameters of ultrasonic cleaning for valve parts.